<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>行内元素和块元素</title>
</head>
<body>
<div >第一个div</div>
<div>第二个div</div>
<div>第三个div</div>
<span>提示1</span>
<span>提示2</span>
<label>first</label>
<label>second</label>
<p>第一段</p>
<p>第二段</p>
<h1>111</h1>
<h1>222</h1>
</body>
</html>